download slf4j as it is required by a test case


git-svn-id: https://svn.apache.org/repos/asf/archiva/redback/redback-components/trunk@1389706 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/modello-plugin-redback-registry/pom.xml b/modello-plugin-redback-registry/pom.xml
index 7eb7e12..a9aa2a2 100644
--- a/modello-plugin-redback-registry/pom.xml
+++ b/modello-plugin-redback-registry/pom.xml
@@ -95,6 +95,12 @@
       <scope>test</scope>
     </dependency>
     <dependency>
+      <groupId>org.slf4j</groupId>
+      <artifactId>slf4j-simple</artifactId>
+      <version>${slf4jVersion}</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
       <groupId>commons-configuration</groupId>
       <artifactId>commons-configuration</artifactId>
       <scope>test</scope>